S-90289A542 1/4"-20 x 1" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Maximum vibration resistance through serrated locking design that prevents loosening under dynamic loads
• Exceptional thread engagement with Class 3A fit ensuring precise, secure fastening in critical applications
• High-strength performance backed by Rockwell C45 hardness for reliable load-bearing capacity
• Easy installation and removal with 1/8" hex drive design allowing efficient maintenance access
• Enhanced gripping power from cup point tip that digs into mating surfaces for permanent positioning
• Industry-standard compatibility with UNC coarse threads for broad application across equipment and machinery

Professional Applications & Engineering Value

Engineered for precision positioning and permanent fastening in industrial machinery, this black-oxide alloy steel set screw delivers exceptional performance where vibration resistance and reliability are critical. The cup point design creates permanent indentation in shaft components, preventing rotational slippage in pulleys, gears, and collars. With Class 3A thread fit and UNC coarse threading, installation is streamlined while maintaining superior holding power in high-stress applications. The serrated locking feature beneath the head provides additional anti-rotation security, making these hex headless set screws ideal for automotive assemblies, manufacturing equipment, and precision instruments where maintenance access is limited but performance cannot be compromised.

Specification Summary & Compliance

This 1/4"-20 x 1" set screw features precision Class 3A thread fit with UNC coarse thread specification, ensuring dimensional accuracy and reliable performance. Manufactured in compliance with ASME B18.3 standards for dimensional consistency and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations for environmental safety and restricted substance management. The Rockwell C45 hardness rating guarantees consistent mechanical performance across production batches, while the black-oxide surface treatment provides corrosion protection without compromising dimensional tolerances.